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Percent Compostion Lab
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Feb 15 2009, 11:20 PM EST by
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Thread started: Feb 15 2009, 11:20 PM EST
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The lab requires 3 brands of Chocolate Chip Cookies
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lpaisley |
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Finding Moles and atoms in some common elements
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Feb 13 2009, 10:33 PM EST by
lpaisley |
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Thread started: Feb 13 2009, 10:33 PM EST
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This lab involves an unknown. Use any element that is safe, cheap, and available. Possibilities might be Zinc, Tin, Sulfur, Carbon.
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Flame Tests
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Oct 30 2008, 3:40 PM EDT by
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Thread started: Oct 29 2008, 10:24 PM EDT
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Ok, so we are doing flame tests right now. I was looking youtube and found this video
http://www.youtube.com/watch?v=jJvS4uc4TbU
Any idea how to do this?
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Last Reply:
RE: Flame Tests
By: ,
Oct 30 2008, 3:40 PM EDT
Take the pyrex petri dishes and connect them to a handle, preferably plastic, with silicone adhesive on the underneath. This will allow you to hold the sample as in the video. A floor fan at the door on low will ventilate the fumes so there will not be the buildup around the feet.
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lsandford |
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Sig Figs
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Sep 12 2008, 12:46 AM EDT by
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Thread started: Aug 13 2008, 4:32 PM EDT
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Hello!
I am beginning my first year as a chemistry teacher in district 99 and am wondering if anyone out there has found a really great way to show students the importance of significant figures? I'm looking for something that really resonates with them so that during second semester they don't have to ask, "do we really have to use sig figs on this lab?" (which I'm sure is inevitable, but I'm new and I can dream right)? Thanks! Laura Sandford
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Last Reply:
RE: Sig Figs
By: ,
Sep 12 2008, 12:46 AM EDT
One of the best ways I have found to enter into a discussion of Sif Figs or more importantly uncertanty in measuerment is to wait until you cover density or the first lab you make measurements and calculations. Some students will round their answers ot 1 or 2 figures others will give you calculator answers with 6-7. When you return the labs raise the question of who is right. Actually do a high and low calculation. In otherwords take each measurement at its maximum and minimum estimated values and calculate how high andlow the ansersr could be. (balances have tolerances printed on them). You can easily show the students that only the numbers included in both the high and low are reliable. I then explain that rather than calculate a high and low value we use Sig figs to provide a rough estimmat of degree of precision that our answers should reflect. Since Sig figs do not appear on any of the state standards I usualy tell my students to round answers to three Sif Figs which is about the limit of what we can actually measure n our Labs.
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What do you do on the first day of school?
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Aug 23 2008, 5:50 PM EDT by
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Thread started: Aug 13 2008, 12:47 PM EDT
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Hi! We begin with our first day of 10 minute class periods where there is only time to find seats, take attendance, and maybe squeeze in one demo. I usually do a flame test demo in watchglasses with several metals and talk to them a little about fireworks.
On our second day, I talk to them about what it means to learn, why learning big concepts is better than memorizing facts. I play the game where they have to figure out the rule. I say it's blue, but not green, it's hair, but not teeth, it's a desert, but not dessert...for example. When they figure out the big concept, that the second word has a double letter, then they wouldn't have to memorize what I have said. Then I go over the syllabus.
So...I was wondering what are some of the cool things that you do on the first day of school to spice things up.
~Mindy Waters St. Joseph-Ogden High School St. Joseph, IL
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RE: What do you do on the first day of school?
By: ,
Aug 23 2008, 5:50 PM EDT
This is actually for a later topic, but on the first day I take pictures of individual students with their names written above their heads on the board behind them. I say I do this to help learn their names, which is part of it, as I can view it as a slideshow and drill it into my head. In a month or two it comes back at the "periodic table of students" where they are arranged based on some trend in columns. I avoid the ones that could be offensive (weight, height, or ethnicity...) but some common families are: hands crossed, striped shirts, necklaces, shirt under shirt, hoodie, sports team logo, brand logo, hands behind back, collared shirt, etc. Then within a family, the students are in order of least smiling to most smiling. When we get to periodic trends, I hang it up and kids are drawn to it to spot the trends. Hopefully it helps them remember there are similarities within columns, but even these have variability that goes according to some pattern. It takes some time to put it together, but it gets good review.
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Labs
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Jun 28 2008, 5:16 PM EDT by
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Thread started: Jun 28 2008, 5:11 PM EDT
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We start stoichiometry making S'mores...we do a couple of other simple labs to illustrate the concept and then our discussion and problem solving go in 2 directions: air bags & burning of fossil fuels and CO2 production. This lab comes after discussion and calculation with air bags as the context.
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stoich lab
By: ,
Jun 28 2008, 5:16 PM EDT
oops! the lab is below in the "attachments" section. "42"
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Questions about a Demo?
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Jun 24 2008, 4:24 PM EDT by
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Thread started: Jun 24 2008, 4:24 PM EDT
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Do you need a demo to spice up or help a topic? Do you have a demo that does not work right? Do you have the start of a new demo but don't know where to take it? This is what this discussion board is for!
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